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/*
SSSD
selinux.c
Copyright (C) Jakub Hrozek <jhrozek@redhat.com> 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
#endif
#include "util/debug.h"
#ifdef HAVE_SELINUX
/*
* selinux_file_context - Set the security context before any file or
* directory creation.
*
* selinux_file_context () should be called before any creation of file,
* symlink, directory, ...
*
* Callers may have to Reset SELinux to create files with default
* contexts:
* reset_selinux_file_context();
*/
int selinux_file_context(const char *dst_name)
{
struct selabel_handle *handle = NULL;
char *scontext = NULL;
char *pathname = NULL;
int ret;
if (is_selinux_enabled() != 1) {
return EOK;
}
pathname = realpath(dst_name, NULL);
if (pathname == NULL) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, "realpath of %s failed [%d]: %s\n",
dst_name, ret, sss_strerror(ret));
goto done;
}
/* Get the default security context for this file */
handle = selabel_open(SELABEL_CTX_FILE, NULL, 0);
if (handle == NULL) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to create selabel context "
"[%d]: %s\n", ret, sss_strerror(ret));
goto done;
}
ret = selabel_lookup(handle, &scontext, pathname, 0);
if (ret < 0 && errno == ENOENT) {
scontext = NULL;
} else if (ret != 0) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to lookup selinux context "
"[%d]: %s", ret, sss_strerror(ret));
goto done;
}
/* Set the security context for the next created file */
if (setfscreatecon(scontext) < 0) {
if (security_getenforce() != 0) {
ret = EFAULT;
goto done;
}
}
ret = EOK;
done:
free(pathname);
freecon(scontext);
if (handle != NULL) {
selabel_close(handle);
}
return ret;
}
int reset_selinux_file_context(void)
{
setfscreatecon(NULL);
return EOK;
}
#else /* HAVE_SELINUX */
int selinux_file_context(const char *dst_name)
{
return EOK;
}
int reset_selinux_file_context(void)
{
return EOK;
}
#endif /* HAVE_SELINUX */
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